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Next on Episode 4

Preview: Episode 4 | 30s

Join a team of laser-scanning experts in the Incan city to answer three main questions. How did the Inca build a city atop a mountain ridge? How were the terraces constructed? How did they supply water to the city? Premieres Wednesday, December 9, 2015 at 10/9c. Check local listings.

Aired: 12/09/15

Rating: TV-PG

The full episode is no longer available for online streaming. Why?

Please continue to enjoy extra(s) from this episode. The full episode is still available for purchase through the "Buy Now" links.

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